Tegg 1PC 4x4 Keypad MCU Board Matrix Array Switch Tactile Keypad 16 Button for Arduino - Ultimate Keypad Solution Review

The keyboard worked fine for the first week. At the beginning of the second week, one of the keys failed (key "4”). At the end of the same week, the "1" key also failed. At this point, the device was best used by holding the bottom of my garbage bag. I guess the old adage you get what you pay for is my lesson.

Due to a lack of product information, it was very difficult to determine the correct pinout for this keyboard. After taking the keyboard apart, I found that the pinout is completely different than the more popular membrane keyboards. Looking at the keyboard from the front, the pinout is from left to right: C1 C2 C3 C4 R1 R2 R3 R4 (mostly columns and rows are swapped). Works well and feels good now that I figured out the pinout. It would be nice if this information was printed on the circuit…

Purchased for a home automation project. The lack of any documentation meant I had to do some research to understand the pinout. (Hint: Ignore the first and last holes.) Soldered to the pins, but none of my ESP8266 boards read the middle rows. I ended up buying a few more keyboards, another from this one and a few from WishioT (thinking I had messed up the ports with my poorly sighted hands). WishioT's boards are identical but a few dollars cheaper. www.amazon.com com/gp/product/B07B4DR5SH/…